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Active Terminator for Transmission Line

Publishing Venue

IBM

Related People

Feth, GC: AUTHOR

Abstract

This article relates generally to transmission line termination and, more particularly, to the incorporation of active circuit devices to reduce power dissipation. Active switching devices in place of the usual resistive characteristic impedance terminators for transmission lines for binary signals can greatly decrease the average standby power dissipation. In the schematic binary circuit of Fig. 1, transmission line ZO is driven by push-pull driver Pu-Pd and terminated by the addition of controlled switches Su and Sd in series with respective resistors Ru and Rd on either side of node NR. Switch Su closes and switch Sd opens when node voltage is high. The switches function in the opposite manner when voltage is low.

Country

United States

Language

English (United States)

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Active Terminator for Transmission Line

This article relates generally to transmission line termination and, more
particularly, to the incorporation of active circuit devices to reduce power
dissipation. Active switching devices in place of the usual resistive characteristic
impedance terminators for transmission lines for binary signals can greatly
decrease the average standby power dissipation. In the schematic binary circuit
of Fig. 1, transmission line ZO is driven by push-pull driver Pu-Pd and terminated
by the addition of controlled switches Su and Sd in series with respective
resistors Ru and Rd on either side of node NR. Switch Su closes and switch Sd
opens when node voltage is high. The switches function in the opposite manner
when voltage is low. This action retains the new level of node voltage until
changed to the opposite state by the driver, but opens the direct current path to
ground in the standby state, eliminating power dissipation. The push-pull driver
provides pull-up and pull-down for the high and low levels. An example of an
implementation of an active termination circuit is shown in Fig. 2 using npn
bipolar transistors for switches Su and Sd and logic gates for the controls.
Transistors Q1 and Q2 together with Rb provide a logical inversion of the binary
output signal B at the receiving end of the transmission line. Qd inverts again,
consistent with the value B at its collector. Moreover, transistor Q3 inverts the
output of Q2 again, which drives the base of Qu and then the emitter of Qu with
the same sense as the signal B. T...